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Materials and Methods Useful to Induce Cell Death via Methuosis

a technology of methuosis and materials, applied in the field of biological and chemistry, can solve the problems of large vacuoles and disrupt the integrity of the cellular membrane, and achieve the effect of reducing the number of vacuoles and reducing the number of cells

Inactive Publication Date: 2014-10-30
UNIVERSITY OF TOLEDO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a new compound that can quickly kill different types of glioblastoma cells, even those that are resistant to conventional drugs. This suggests that this compound could be a prototype for a new class of medicines that can treat tumors that are difficult to treat with existing drugs.

Problems solved by technology

It involves stimulation of macropinocytosis (cell drinking), combined with defects in clathrin-independent endocytic vesicle trafficking, ultimately resulting in accumulation of large vacuoles that disrupt cellular membrane integrity.

Method used

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  • Materials and Methods Useful to Induce Cell Death via Methuosis
  • Materials and Methods Useful to Induce Cell Death via Methuosis
  • Materials and Methods Useful to Induce Cell Death via Methuosis

Examples

Experimental program
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Effect test

example 1

Methods and Materials

[0162]Test Compounds and Reagents

[0163]Compounds I, II (MIPP), and IV were purchased from Chembridge Corporation. Compound III was purchased from TimTec, LLC. Each of these compounds was stored at −20° C. as a 5 mg / ml stock solution in DMSO, and then diluted to the mentioned final concentration in cell culture medium. Filipin and bafilomycin A1 were obtained from Sigma-Aldrich. Filipin was stored at −20° C. as a 50 mg / ml stock in DMSO and bafilomycin A1 was stored at −20° C. as a 10 μM stock in DMSO. EHT 1864 was provided by Exonhit Therapeutics. z-VAD-fmk was purchased from Bachem.

[0164]Library Compounds

[0165]Compounds 1-8 used for initial screening of methuosis-inducing activity (FIG. 1) have identification numbers as follows: 1, 5224450; 2, 5224466; 3, 5312531; 4, 7995005; 5, 7916760; 6, 6161388; 7, 5267766; and 8, 6155359. All compounds are certified by the vendor to be at least 90% pure with NMR confirmation of structure.

[0166]General Methods

[0167]Reagents ...

example 2

Small Molecules that Induce Cytoplasmic Vacuolization

[0193]Disclosed herein is Compound I which caused a striking accumulation of numerous phase-lucent cytoplasmic vacuoles within 4 h when applied to U251 glioblastoma cells (FIG. 1). When added at a concentration of 1 μM, the morphological effects of Compound I were transient, with most of the vacuoles dissipating by 24 h (FIG. 1). However, at 10 μM, the morphological effects of Compound I persisted for 24 h and beyond. A search of the broader 700,000 compound Chembridge collection yielded several additional compounds with >75% similarity to Compound I. Of these, 3(2-methyl-1H-indol-3-yl)-1-(4-pyridinyl)-2-propen-1-one (FIG. 1, Compound II), behaved similarly to Compound I when tested at 1 μM, but induced vacuoles that were larger and more numerous than those induced by Compound I when tested at a concentration of 10 μM (FIG. 1).

[0194]Closely related compounds with similar or identical indole ring structures, but with variations in ...

example 3

The Origin of the Vacuoles Induced by MIPP is Consistent with Methuosis

[0195]It is further disclosed herein that the vacuoles induced by MIPP were derived from macropinosomes, since this is a hallmark feature of methuosis. Macropinocytosis is a form of clathrin-independent endocytosis wherein intracellular vesicles are initially generated from projections of the plasma membrane termed ruffles or lamellipodia, which surround and trap extracellular fluid. Time lapse phase-contrast microscopy covering the period between 13-80 min after addition of MIPP revealed waves of macropinocytotic vesicles entering the U251 cells from regions of active membrane ruffling. The nascent vesicles can be seen coalescing with each other to form progressively larger vacuoles within the cytoplasm as shown in FIG. 1. Time lapse studies performed after the first 95 min showed a decline in the initial burst of macropinocytotic activity, although the vesicles already formed within the cell continued to enlarg...

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Abstract

The present invention provides materials and methods to induce cell death by methuosis, a non-apoptotic cell death mechanism. Small molecules herein are useful for treating cell proliferation disorders or anomalies, particularly, but not exclusively, cancer. Methods related to the research and pharmaceutical use of the small molecules are also provided herein.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is filed under the authority of the Patent Cooperation Treaty and claims priority to U.S. Provisional Application Ser. No. 61 / 446,354 filed under 35 U.S.C. §111(b) on Feb. 24, 2011; the disclosures of all priority applications are incorporated herein by reference.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH[0002]This invention was made with government support under Grant Number R01 CA115495 awarded by the National Institutes of Health. The government has certain rights in the invention.FIELD OF THE INVENTION[0003]This invention pertains to the field of biology, chemistry and medicine. The invention specifically pertains to materials and methods to induce methuosis, a form of non-apoptotic cell death.BACKGROUND OF THE INVENTION[0004]Several different forms of non-apoptotic death have, based on specific morphological or molecular criteria. These include death associated with accumulation of autophagosomes, as well as se...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D401/06A61K45/06A61K31/4439
CPCC07D401/06A61K45/06A61K31/4439A61K31/404C07D209/08C07D209/12C07D403/06C40B40/04
Inventor MALTESE, WILLIAM A.ERHARDT, PAUL W.ROBINSON, MICHAEL W.OVERMEYER, JEAN H.
Owner UNIVERSITY OF TOLEDO
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